Hart. remove link hover from images

From https://github.com/mysociety/FixMyStreet-Commercial/issues/487
Hart. fix inconsistent header height

From https://github.com/mysociety/FixMyStreet-Commercial/issues/487
Hart. more spacing on .mappage .content

From https://github.com/mysociety/FixMyStreet-Commercial/issues/487
Hart. correct links for FAQ

From https://github.com/mysociety/FixMyStreet-Commercial/issues/487
[Hart] avoid the word "problems" on front page

From https://github.com/mysociety/FixMyStreet-Commercial/issues/487

Unlike the previous commit, we hadn't already overridden a template,
and this seems like a tiny change to do this.  As per matthew, adding
IF switch in template